Unknown

Dataset Information

0

In situ observation of macroscopic phase separation in cobalt hexacyanoferrate film.


ABSTRACT: Lithium-ion secondary batteries (LIBs) store electric energy via Li+ deintercalation from cathode materials. The Li+ deintercalation frequently drives a first-order phase transition of the cathode material as a result of the Li-ordering or Li-concentration effect and causes a phase separation (PS) into the Li-rich and Li-poor phases. Here, we performed an in situ microscopic investigation of the PS dynamics in thin films of cobalt hexacyanoferrate, LixCo[Fe(CN)6]0.9, against Li+ deintercalation. The thick film (d = 1.5 μm) shows a characteristic macroscopic PS of several tens of μm into the green (Li1.6Co[Fe(CN)6]0.9) and black (Li.6Co[Fe(CN)6]0.9) phases in the x range of 1.0 < x < 1.6. Reflecting the substrate strain, the thin film (d = 0.5 μm) shows no trace of the PS in the entire x region. Our observation suggests that the macroscopic PS plays a significant role in the charge/discharge dynamics of the cathode.

SUBMITTER: Takachi M 

PROVIDER: S-EPMC5311949 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC8564753 | biostudies-literature
| S-EPMC5707369 | biostudies-literature
| S-EPMC3950641 | biostudies-other
| S-EPMC6973338 | biostudies-literature
| S-EPMC5668891 | biostudies-literature
| S-EPMC9086977 | biostudies-literature
| S-EPMC5615671 | biostudies-literature
| S-EPMC6836749 | biostudies-literature
| S-EPMC5465911 | biostudies-literature
| S-EPMC8335821 | biostudies-literature